Elevator doorlock



Oct. 5, 1926.

E. G. CLARK ELEVATOR DOORLOCK Filed Sept.

1924 2 Sneets-$heet l rl lnllilrllilllllllllilI 1 WWW INVENTOR III Patented Oct. 5, 1926.

ZELGIN e. CLARK, or FLINT, MICHIGAN.

ELEVATOR DOORLOCK.

Application filed September This invention relates to elevators, and is illustrated as embodied in an elevator having doors for its shaft, with a circuit which remains broken unless all the doors are closed. One object of the invention is to arrange the parts of the look so that the circuit will be closed without fail when the door is locked, in spite of variations in the positions of the different'parts. This is of especial importance in freight elevators, in which it is desirable to avoid the necessity of fitting the doors with extreme care and accuracy.

This and other minor objects of the invention will be apparent from the following description of one illustrative embodiment shown in the accompanying drawings, in which Figure l is a diagrammatic view, in vertical section through an elevator and its shaft, with one door open and another door closed; I

Figure 2 is an inside elevation of part of the closed door, with the lock casing broken away to show the circuit-controlling lock; and

Figures 3 and 4 are both horizontal sec tions on the line 33 of Figure 2, but showing the closing of the circuit by the look when the door is in different positions.

In Figure l is shown an elevator 10 in a shaft 12. the elevator being raised and lowered by cables 4 from mechanism operated. or controlled by an electric circuit inciuding a set of cables 16 along the elevator shaft. The circuit is controlled by the operator through acontroller 18 connected to a cable 20. One door 22 of the shaft is shown open. and a lower door 24 is shown closed and locked. These parts, except as further described below, may be of any desired constru ction.

Each door carriesalocking bolt 26 sliding in a guide 28, and connected to an operating bellcrank lever 30 by a link 32. When the door is closed, bolt 26 may project into an opening in the :side of a stationary casing 34 to lock the door.

The ends of wires 36 of cables 16 are passed into the casing 34 of each of the locks, the wires being carried out through a conduit 88. Inside the casing, one of the wires 36 is connected to a stationary contact, shown as a yielding leaf spring member 40. The other wire is connected to a movable s, 1924. Serial No. 736,562.

contact 42 on an insulating arm 44 held between a member 46 pivoted at 48 and a yielding clamp member 50, arm 44 being secured by a screw or bolt 52.

I Arm 44 is urged in a direction to separate the contacts and open the circuit, by a coil spring 54. It is swung against the resistance of this spring to close the circuit when the door is locked. by a plunger 56 in the end of bolt 26. The plunger is backed by a spring 58 in a recess in the bolt, spring 58 being substantially stiffer or stronger than spring 54. The plunger is held in the bolt by a bushing 60 having a conical or tapered outer surface, the more easily to enter the opening in casing 34 in locking'the door.

As will appear by comparison of Figures 3 and 4, the above-described arrangement insures the closing of the circuit when the door is locked, even if the parts vary considerably in position. In Figure 4, by way .of example, door 24, which is in its lower or closed position, has taken a position a considerable distance to the left of its position in Figure 3, as indicated at 62.

While one illustrative embodiment of the invention has been described in detail, it is not my intention to limit its scope to that particular embodiment. or otherwise than by the terms of the appended claim.

I claim A circuit-controlling loo; for a door for the shaft of an electrically-controlled elevator, which is in series with the parts of the elevator circuit, and which comprises, in combination, an operator-controlled looking bolt on the door, a stationary casing adjacent the door which has an opening in one side into which the bolt may project when the door is closed to lock the door, a pair of circuit wires entering the casing, relatively movable contacts in the casing connected respectively to said wires, a spring separating the contacts, plunger in the end of the locking bolt for forcing the contacts together when the door is locked, and a spring in the bolt behind the plunger which is stronger than the spring separating the contacts, to insure closing of the circuit when the door is locked in spite of a considerable variation in the relative positions of the parts.

In testimony whereof I affiX my signature.

ELGIN G. CLARK. 

